The  morris peters co



No. 622,060. Patented Mar. 2a, |899. J. A. MURPHY & A. D. RowE.

PNEUMATIC TIRE.

(Application led July 20, 189B.) (No Model.)

UNITED STATES PATENT CEEICE.

JAMES A. MURPHY AND AMOS D. RCWE,-OE HOLYOKE, MASSACHUSETTS, ASSIGNORSOF ONE-THIRD TO CHARLES H'. MORGAN, OE SAME PLACE.

PN EUMATIC TIRE.

SPECIFICATION forming part of Letters Patent No. 622,060, dated March28, 1899.

Application tiled July 20, 1898. Serial No. 686,429. (No model.)

To @ZZ whom, it may concern:

Be it known that we, J AMES A. MURPHY and AMos D. Rown, citizens of theUnited States of America, residing at Holyoke, in the county of Hampdenand State of Massachusetts, have invented new and useful Improvements inPneumatic Tires, of which the following is a specification.

This invention relates to pneumatic tires for vehicles, and moreespecially to the construction of a detachable protective shoe for tiresof this class, whereby the inner air-receiving tube, of comparativelylight construction, may be protected against puncturing when in use by aflexible shoe placed over it when in a deflated or partially-deiiatedcondition and secured firmly thereto by the iniiation of the said innertube; and the invention consists in the construction of the protectiveshoe, as fully set forth herein and particularly pointed out in theclaim.

I In the drawings forming part of this specification, Figures 1 and 2are perspective sectional views of a tire and part of the rim of a wheelembodying this invention, Fig. 2 showing a slight modification of theconstruction shown in Fig. l. Fig. 3 is a sectional view of a tire,showing a further modification of the construction shown in the otherfigures.

Referring to the drawings, Fig. l shows a portion of a rim A of a wheel,to which is secured by the usual method of attaching single-tube tiresthe air-receiving tube B. This inner tube or tire, while not made eitheras light or elastic as the inner tubes of the socalled clencher-tires,is still not as heavy as the ordinary single-tube tire, which isdesigned to be used without a protective outer tire, yet it has aboutthe saine elastic quality as the latter. A suitable valve of anywellknown construction, which it is not deemed necessary to show in thedrawings, communicates with said inner tube B through the rim A in theusual manner. Said inner tube B is provided with ribs C, molded on theeX- terior surface thereof, either near and parallel with the edges d ofthe rim A, as shown in Fig. l, or, as shown in Fig. 2, said ribs-may beplaced on the tread part of said inner tube close together, forming thusa narrow channel b between them. In either position their purpose andfunction is the same and will be described farther on.

The inner tube B is protected by a shoe D of tougher and somewhat lesselastic -material and is made asy ordinary single-tube tires are made,of rubber and layers of textile material, and is molded on a form ofsuch shape that normally when removed from the tube its edges d willnearly spring together. These edges may be sprung apart and the shoeplaced over the tube B when the latter is in a partially-dedatedcondition, and said inner tube when iniiated will expand and its surfacebe forced against the interior surface of said shoe, as shown in thedrawings. The expansion of the inner .tube will force the edges d of theshoe apart still farther and cause the latter to grip the tube withsufficient force to hold it in place. For providing said shoe D withpositively-fixed diameters at the edges d thereof wire rings R of lessdiameter than the diameter of the inner tube B at its center areembedded in said edges d of the shoe, as shown in the drawings, and whensaid shoe is in operative position on-the said tube said rings will liein a position. on said tube inside of the largest transverse diameter ofsaid tube, as shown, and as long as said tube B remains in its expandedcondition said shoe will be irremovably secured to said tube by reasonof the difference in plane diameters between saidr'ings R and said tube,as described.

For the purpose of guarding against a side slipping movement of thewheel, whereby frictional movements might be caused between thesurfaceof the tube B and its shoe D, two ribs C are molded on thesurface of the tube B, as stated, and may be placed, as shown in Fig. 1,along each side of the tube B in such position that they will lie nearand substantially parallel with the edges ct of the rim A, leavingsufficient space betweensaid edges and said ribs for receiving thebeaded edges d of the shoe D. Should said ribs C be located as shown inFig. l, then the edges d of the shoe D would have the form shown in saidligure-viz., they would be molded entirely on the inside of the saidedgesw-whereby they would better engage the ribs C. Should the said ribsbe located as in Fig. 2, however, where they serve the same purpose asin the position shown in Fig. l, said edges d of the shoe would notrequire the inturned bead on the edges thereof shown in said Fig. l.

With the ribs C located on the tread side of the tube B, as seen in Fig.2, the inner surface of the shoe would be provided with a rib C',centrally located thereon and extending entirelyaround the shoe andtting closely the channel lformed by said two ribs C. The said ribs C,as shown in either Fig. l or Fig. 2, provide equally well against thesetting up of frictional movements between said tire and said shoe byreason of lateral pressure brought to bear on the said shoe, as inturning a corner. It' desired, the single rib Cmay be located on theinner tire or tube B and be made t0 fit in between two ribs C C, locatedon the inner surface of the shoe D; but this would be a mere reversal of`the construction shown and quite Within the scope of the invention, aswould also the construction shown in Fig. 3, in which the ribs areomitted altogether.

The preferred construction of the inner surface of said shoe is as shownin the drawings, with the ribs or corrugations m extending entirelyaround said inner surface of the shoe, against the edges of whichcorrugations said inner tube will bear. The particular form of thecorrugations is immaterial, their object being to increase the distancebetween the outer surface of the inner tube and the outer surface of theshoe, whereby said inner tube will not be so liable to being puncturedas it would be if nearer that part of the tire in contact with the road.

Having thus described our invention,what we claim, and desire to secureby Letters Patent, isv In a vehicle-wheel, the combination of a rim, anair-receiving tube, a protective shoe of flexible material iitted oversaid tube, beaded edges on said shoe, wire rings embedded in said edgesand having a smaller diameter than the plane diameter of said tube atits greatest transverse diameter, ribs lying on the outer surface of,and concentric with, said tube and extending therearound inside of itsgreatest transverse diameter, for engagement with the beaded edges ofsaid shoe, parallel interengaging ribs on the outer surface of the treadpart of said air-tube, and on the inner surface of said shoe foreffecting a separation of the contiguous surfaces of said tube and shoe,and preventing side slip of the latter, substantially as described.

JAMES A. MURPHY. AMOS D. ROlVE.

Witnesses:

K. I. CLEMoNs, HENRY A. CHAPIN.

